Code First vs Database First Approach in Entity Framework

Code First and Database First are two approaches in Entity Framework for defining the data model.

Code First Approach

In the Code First approach, you define the data model using C# or VB.NET classes and properties. The database schema is then automatically generated based on these classes and their relationships.

Code First is typically used in scenarios where you want to start working on the application's data model without having an existing database schema. It is also useful in scenarios where the data model is complex and requires a high level of customization.

Database First Approach

In the Database First approach, you start by creating the database schema using a visual designer or by importing an existing database. Entity Framework then generates the corresponding C# or VB.NET classes based on the database schema.

Database First is usually used when you have an existing database schema that you want to work with or when you prefer to design the database first before implementing the application's data model.

When to Use Each Approach

• Code First: Use Code First when you want to define the data model using classes and have the database schema generated automatically. This is suitable for new projects or projects where the database schema can be easily derived from the classes.
• Database First: Use Database First when you already have an existing database schema that you want to work with, or when you prefer to design the database schema first. This is suitable for projects where the database schema is already established or when working with legacy databases.